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v3.23.1

Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Unbilled Receivables, Current | $ 11,608 |  | $ 11,608 |  |
Costs and estimated earnings in excess of billings | 47,956 |  | 47,956 |  | $ 52,076
Billings in excess of costs and estimated earnings | (94,829) |  | (94,829) |  | $ (84,936)
Contract with Customer, Liability, Revenue Recognized |  |  | 52,350 | $ 45,115 |
Performance Obligation Next 12 Months | 833,212 |  | 833,212 |  |
Revenue, Remaining Performance Obligation, Amount | 1,012,111 |  | 1,012,111 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 568,881 | $ 501,593 | 1,143,755 | 982,102 |
Contract with Customer, Liability, Revenue Recognized |  |  | 52,350 | 45,115 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 69,033 | 68,815 | 129,300 | 138,063 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 141,120 | 130,639 | 288,365 | 258,028 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 52,616 | 41,733 | 101,900 | 83,829 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 306,112 | 260,406 | 624,190 | 502,182 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 512,409 | 450,398 | 1,019,904 | 885,909 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 62,954 | 64,346 | 117,551 | 129,206 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 92,392 | 85,722 | 179,666 | 174,144 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 50,951 | 39,924 | 98,497 | 80,377 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 306,112 | 260,406 | 624,190 | 502,182 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 56,472 | 51,195 | 123,851 | 96,193 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 6,079 | 4,469 | 11,749 | 8,857 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 48,728 | 44,917 | 108,699 | 83,884 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,665 | 1,809 | 3,403 | 3,452 |
Time-and-materials Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
industrial Services [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 11,562 | 15,837 | 22,516 | 30,653 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 41,054 | 25,896 | 79,384 | 53,176 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 211,426 | 192,368 | 438,254 | 365,896 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 94,686 | $ 68,038 | $ 185,936 | $ 136,286 |

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